How to remove the ctfhost virus

Most antivirus programs identify ctfhost.exe as malware—for example Kaspersky identifies it as not-a-virus:RiskTool.Win64.BitCoinMiner.aai or not-a-virus:RiskTool.Win64.BitCoinMiner.aaz, and Symantec identifies it as Trojan.Gen.2.

The free file information forum can help you find out how to remove it. If you have additional information about this file, please leave a comment or a suggestion for other users.

Click to Run a Free Virus Scan for the ctfhost.exe malware

Ctfhost.exe file information

The process known as Microsoft © Windows © Operating System appears to belong to software CTF Host by Microsoft (

Description: Ctfhost.exe is not essential for Windows and will often cause problems. Ctfhost.exe is located in a subfolder of the user's profile folder or sometimes in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 617,472 bytes (35% of all occurrences), 617,984 bytes or 612,864 bytes. 
Ctfhost.exe is not a Windows core file. The program has no visible window. The application listens for or sends data on open ports to a LAN or the Internet. ctfhost.exe appears to be a compressed file. Therefore the technical security rating is 83% dangerous.

Uninstalling this variant: There is a possibility to contact Customer Service or remove the entire program µTorrent using Windows Control Panel.

Recommended: Identify ctfhost.exe related errors

Important: You should check the ctfhost.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


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Best practices for resolving ctfhost issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active ctfhost process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the ctfhost.exe on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

ctfhost.exe [all]